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Cold Temperature and Low Air Pressure TestingIEC 60068-2-40 Combined Cold and Low Air Pressure Testing

IEC 60068-2-40 combines cold and low air pressure compliance testing to evaluate equipment and component integrity. As an ISO 17025-certified environmental test lab, we realize the importance of IEC 60068-2-40 cold and altitude testing. Meeting the environmental IEC 60068 requirements can be difficult. We understand the challenges and guide companies through the process.

Keystone Compliance creates an accurate test plan to eliminate expensive over-testing. Our proven process helps avoid product launch delays. Furthermore, we expedite comprehensive reports shortly after completion of the test. Keystone’s engineers take a consultative approach throughout the entire test program. 

Request a quote to see why so many companies partner with Keystone Compliance. Have a question about our IEC 60068-2-40 accredited test facility? Contact us or call (724) 657-9940 and we will determine the best course of action.

Summary of IEC 60068-2-40 Cold and Low Air Pressure Testing

This environmental test standard evaluates the ability of components or equipment to be stored and used under a combination of conditions. The low-temperature and low-altitude conditions are simultaneous.

IEC 60068-2-40 Testing Procedures

This test is a combination of Test Ab or Ad: Cold, and Test M: Low air pressure.


First, the unit under testing is introduced into the chamber in the unpacked, switched-off state, in its normal position, or as otherwise discussed. The specimen is subjected to appropriate conditions specified in IEC 60068-2-1. In the case of operational tests, the unit is checked to make ensure that it is capable of operation. 


Preferred temperatures may range from 25 C to 55 C. On the other hand, air pressure can be as low as 44 mbar to 700 mbar. Generally, tests are performed for a total of 2 or 16 hours.

For operational tests, intermediate measurements are performed during the final hour of the low-pressure period. The unit under testing is switched off or unloaded before the air pressure is restored.

Once the temperature is maintained, the chamber air pressure is reduced to the appropriate severity. The change in air pressure must not exceed 100 mbar per minute.

Next, the unit is visually inspected, and electrically and mechanically checked for any form of malfunction.


Once the test is complete, the following details are given:

  • Preconditioning
  • Initial measurements
  • Details of mounting or supports
  • State of specimen (including cooling system)
  • Severity of temperature, pressure, and duration of exposure
  • Loading condition during recovery
  • Final measurements

Expert IEC 60068-2-40 Cold and Low Air Pressure Compliance Testing

Our team strives to give our customers more time and energy on product development instead of testing. In addition to IEC 60068-2 testing, Keystone has a full scope of expertise including fungus, humidity, and IP code testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. 

Request a quote to receive testing services tailored to your specific requirements.